Ballers

Spencer Strasmore (dwayne the rock johnson) comes back to his old firm to try and buy his former division in the company.  He brings a million dollars cash with him to make a statement with his offer.  He has the money in a fendi man-bag, what else would you put a million dollars cash in.  The bag has a light bulb keychain (bag charm) on it.  This keychain is made from sheepskin.  These keychains are more of a bag charm but they have key rings on them and can be used as a keychain.  So I am going to count it as such.  I have added a closeup picture of that keychain, it is a different color though.

This was most likely put in the show as product placement as are most of the other clothes and fashions.  Designers will quite often give their clothes to shows so they get screen time and publicity.

Zootopia

Judy Hopps cracked the case and races back to Zootopia.  She takes her parents farm truck.  Their keychain is a felt (fiber art) carrot.  Quite appropriate for rabbits that are carrot farmers.

Last Man on Earth

From season 3 episode 1.  The group is trying to flee their malibu mansion due to an unexpected arrival of armed people.  Their cars are blocked in by the A team van that Todd was driving.  They frantically search for the keys while Todd describes the Mr. T keychain in great detail.  They find them but not before the outsiders greet them.  The keychain is a Mr. T figure and a talking device with appropriate catch phrases.

From season 4 episode 18.  Tandy Phil Miller (Will Forte) gives the key to an RV, to his Brother (Jason Sudeikis) so that he can leave and find more people.  The keychain features a Mexican flag behind the Virgin Mary.

Star Trek: The Next Generation

From Star Trek: The Next Generation season 2 episode 12.  Riker, Data, and Worf are investigating a strange alien structure on a planet.  They beam down to discover it is a recreation of a pulp novel where the setting is the Hotel Royale.  They receive room keys from the front desk and are confused by the ancient keys and keychains.  They most likely have never seen anything like them before.

Blade II

During the last scene of the movie a keychain can be seen.  It is similar to a hotel keychain.  One of the minor villains in the film is visiting an adult entertainment shop and is getting a key for a room for a private show.  But who could possibly be waiting for him...

Archer

From season 6 episode 4.  The gang is trying to get into Mallory's home to check on her and the baby.  Pam has a dolphin keychain and Carol (Cheryl?) has a wooden block keychain.  Pam has an affinity for dolphins and this is another example.

Jurassic World

Claire is trying to escape the mayhem with her two nephews in a Jurassic World truck.  As she starts the engine the keychain can be seen.  It is the classic Jurassic Park logo of the T-Rex skeleton. 

X-Men: Days of Future Past

Wolverine (played by Hugh Jackman) travels back in time to prevent the sentinels from destroying the world.  He arrives in 1973 and immediately encounters some gangsters who want him dead.  He quickly dispatches them and then takes their car.  The gangster's keychain is a white rabbit's foot and a Buick Riviera medallion. 

Naruto

From season 1 episode 20.  Naruto is leaving his home and he locks his door which shows off his keychain.  His keychain is a miniature of another character in the show, Pakkun (a creature who is summoned by Naruto's sensei to aid in missions).  At this point in the show that character had not even been introduced yet so this makes it a bit odd.  Possibly it was a intended for fans of the comic which probably came before the show.

Deadpool

Among the many little easter eggs and jokes in the opening title credits scene in Deadpool is a little keychain.  The keychain is of two figues doing the deed.  Apparently the hired goons Deadpool is disposing of had a sense of humor too.

http://www.artofthetitle.com/title/deadpool/  Has a thorough breakdown of the opening titles.

Frasier

From season 11 episode 17.  This is probably the only visible keychain in the entire run of the show. Frasier has a patient with kleptomania in order to feel more excitement in her life. At the end credits scene Niles steals one of Frasier's sherry glasses and Frasier steals Niles' car keys.  As they exchange their stolen items Niles' Mercedes keychain is seen, which is appropriate since he drives a Mercedes. 

Better Call Saul

From season 1 episode 1 "Uno".  Jimmy McGill who is destined to become Saul Goodman (played by Bob Odenkirk) is at his brother's mailbox.  His brother has a condition where electromagnetic radiation hurts him.  Jimmy puts his electronic devices in the mailbox so as not to bring them close to his brother.  This includes his red electronic keychain for his car.  Which is the same exact same keychain that Walter White uses to operate his turret gun in the final episode of Breaking Bad.  Coincidence from a lazy prop master or a clever call back?

American Dad

From season 7 episode 10.  Roger shows off his FogHorn LegHorn keychain as proof that he cannot refuse anything with the word leg in it.  Because this often featured persona is named legs.

From season 10 episode 7 big stan on campus.  Stan is furloughed from work so to make more money the rest of the family starts a bed and breakfast.  The room keys can been seen behind roger's desk.

From season 12 episode --.  Stan and Hayley are at a Bazooka Sharks game (arena football) and Stan cannot think of something to talk about with Hayley.  So he comes up with the excuse that he needs to buy a keychain.  Someone offers him their's but he pushes her aside anyway to run away from a potentially awkward conversation with his daughter.  The keychain is an adorable bazooka wielding shark.

Ant-Man

Dr. Hank Pym, the original Ant-Man, (played by Michael Douglas) is trapped with his daughter in a building that is about to be destroyed.  They have no escape until Hank reveals that his tank keychain is more than it appears.  They burst through the walls of the building using the keychain because it was actually a real tank that he had shrank earlier.  Even the keychain part is expanded.  His keychain can be seen several times throughout the movie.  And in the early footage of the original Ant-Man that is shown a tank that looks very similar can been seen.  One must assume it is the same tank.

Payback

The head of the outfit gives his son a car for his birthday.  He presents him with the key and an engraved keychain.  Porter, played by Mel Gibson, taunts the mob boss with the knowledge that he kidnapped his son.  He offers to read him the inscription on the keychain and calls it sappy. 

A History of Violence

In the opening of the movie, two mobsters are on the run trying to lie low in small towns.  They are leaving their motel and their blue rabbit's foot keychain can be clearly seen. 

Mortdecai

Mortdecai, played by Johnny Depp, is trying to escape from someone trying to kill him.  He takes a car from his mechanic's while his man servant, played by Paul Bettany, holds off the assassin.  The keychain is the type in which a metal medallion is attached to a piece of leather. 

The Machinist

Trevor Reznik played by Christian Bale confronts the man who he thinks is behind a plot against him. His leather fob keychain can be seen.

Thief

In preparation for the upcoming heist Jim Belushi's character, Barry, is listening in on the owners of the safe for a password to turn off the alarm.  The owners of the safe open their front door and their keychain can be seen.  This type of keychain is hourglass shaped with a metal circle on one end.  There is a notch in the circle where the key is threaded onto the metal bar.

Mission Impossible Rogue Nation

In the beginning of Mission Impossible: Rogue Nation, Ethan Hunt is captured.  The literal key to his escape is on a rabbit foot keychain.  This is most likely a reference to Mission Impossible 3 whose plot centered around the mysterious "rabbit's foot". 

Sex and the City

Charlotte and her ex-mother in law, Bunny, are fighting over her apartment during Charlotte's divorce.  Bunny shows off her keys as proof of her ownership of the apartment.  Bunny has a solid metal bunny keychain.  Quite appropriate. 
From season 5 episode 5

Everybody Loves Raymond

Debra And Raymond are staying at a bed and breakfast to have a romantic weekend.  The bunny keychain on the room key is indicative of the cutesy theme of the bed and breakfast (much to Ray's dismay).

Supernatural

Supernatural has MANY keychains featured over the course of the long running show.  This first keychain is Dean's which is a bullet, it of corresponds nicely with the guys' lives as hunters.  It can be seen several times throughout the show.  This screen cap is from season 5 episode 18. 

From season 1 episode 15

From season 1 episode 16

From season 5 episode 14

From season 4 episode 7   The show features many keychains from the motels and hotels the guys stay at.

From season 14 episode 4   Toys are coming to life and trying to kill a comic book shop employee.  Sam and Dean figure out a ghost has attached itself to the keychain of the shop.  They dispatch the ghost after it inhabits a life size replica of a slasher villain.

Fantastic Four

In the trailer for the upcoming movie Fantastic Four, there is a very telling keychain.  On the rear view mirror of his car, Johnny Storm aka the Human Torch played by Michael B Jordan has a fire flower keychain.  The fire flower being the classic power-up from Super Mario Brothers.  Not only does this reference the human torch's power to control and emit fire but it represents the fact that this Fantastic Four is made up of younger people. 

Cast Away

Chuck Noland (played by Tom Hanks) has a swiss army knife keychain.  Right before his ill fated plane flight he gives Kelly (helen hunt) an engagement ring and his keys.  When he finally returns home she gives him the keys back.

The Hunter

William Dafoe's character, Martin, is just getting his assignment to hunt the, thought to be extinct, Tasmanian Tiger.  A key with a keychain can be seen as he going through his belongings.  It is a silver circle with the number 53 stamped on it.

Hook

Peter Pan (Robin Williams) visits tinkerbell at her home,  which is a cuckoo clock.  She has his personal possessions all around her including his keys and BMW keychain.

Z Nation

Murphy is desperate to get to California due to his worsening condition.  He tries to steal someone's car by biting them and taking their keys.  The man kept talking up his car and its upgrades while drunk in the bar earlier.  His skull key and paracord keychain matches the description of the ride.  From episode 7 Welcome to the Fu Bar.

The gang is using a white van which has a basic pink/purple fob.  Murphy steals the van, which is full of valuable oxycotin, at the end of the first season leaving everyone else to die.  From Episodes 12 and 13.

Criminal Minds Season 1 Episode 1 Extreme Aggressor

The real villain's keychain is revealed just as he is.  It is a metal z which represents his car.

Bob's Burgers Season 5 episode 5 Best Burger

Bob is competing in a best burger cooking competition on the wharf.  But he forgot to bring his special ingredient, black garlic.  He tells the kids to go back to the restaurant to go get it.  He tosses his keys to Gene.  His burger keychain can be seen.  It has been shown in several episodes.

The Andy Griffith Show Season 3 Episode 27 Barney's First Car

Andy's lovable yet gullible sidekick Barney Fife is trying to buy his first car but may in for a different ride than he thought.  The kindly old woman selling the car gives Barney her "husband's" keychain who also just so happened to be named Barney.  It is a white rabbit's foot keychain.  Barney is so nice he tries to refuse the keychain but she won't let him.

Family Guy season 13 episode 4 Brian the Closer

Brian is hiding at a hotel to avoid Quagmire because he tricked Quagmire into buying a crappy condo.  His room key with keychain be clearly seen.  He is staying in room 12.

The Simpsons season 26 episode 6 simpsorama

In this Simpsons/Futurama crossover episode the kids are putting things into a time capsule.  Milhouse puts a rabbit's foot keychain but bart didn't bring anything.  So, he puts his sandwich in there and it just so happens that the time capsule gets buried with toxic waste and the dna from Bart's sandwich combines with Milhouse's keychain to form a rabbit/Bart hybrid monster.  It causes problems in the future which sets in motion the crossover where the Simpsons meet the gang from Futurama.  It all starts with a humble keychain.