My Hero Academia

The class move into their new dorms and they look at each others rooms to see which one is best.  Tokoyami has a goth style room with a keychain to match.

The Saint

The Saint, with Roger Moore. S06_E07 "The Double Take"
The Saint is kept in a house against his will. He says he has to go home to get some clothes. The bad guy says "No way, the butler will go for you" (meaning "Give him your car keys")

Malcolm in the Middle

Malcom in the Middle S01E08 14'10". The big brother just met that girl at the school party. But they pretend they'd been living together for years and years. They have a fight and they give back things one to the other. For instance, she says "i give you back that awful ring you offered me", he answers "i give you back your silly keyring" etc

Kingsman: the Golden Circle

Behind a wall in his house, Eggsy (Taron Egerton) has his secret agent tools and weapons.  Among them are keychains with the Kingsman logo on them.

Silicon Valley

From season 5 episode 8.  The guys need to get somewhere fast so they take the Tesla that Dinesh, Kumail Nanjiani, is paying for but doesn't actually own.  The Tesla keychain is most likely an electronic key for the car.

The Path

From season 3 episode 6.  Sarah Lane's (Michelle Monaghan) keychain is appropriately the symbol for her religion, the eye with rays around it.  The keychain is a wooden eye inside a metal frame.

Cobra Kai

Johnny Lawrence (William Zabka) is passed out on his floor after an apparent binge.  His firebird keychain matches his car, most likely an attempt to continue to live as he did in the 80's.

Counterpart

From season 1 episode 9.  The counterparts are preparing for their infiltration and assault.  One of their keychains can be seen, they are a bottle opener and some kind of clip.

28 Weeks Later

The kids escape the quarantine zone and find a scooter so they can return to their old home.  The key to the scooter is on a corpse and has a yellow plastic fob attached.

Get Out

When things really turn sideways Rose Armitage (Allison Williams) shows her keys and enamel bear face keychain to her boyfriend, Chris Washington (Daniel Kaluuya), signaling her true intentions. 

Captain America Civil War

Peter Parker AKA SpiderMan (Tom Holland) comes home to find Tony Stark there.  His house keys have a keychain on them.  It appears to be a dog tag, or just a generic gray fob.

Logan

Logan and Laura steal a fisherman's truck to continue their journey.  The fisherman's keychain is of course a fish.
Laura has a horse keychain attached to her backpack.

Monk

From Season 1 Episode 1.  Adrian Monk's (Tony Shalhoub) keychain is a silver "T", it belonged to his late wife Trudy.  Adrian is at a funeral for a case, he is sitting in a balcony. He misplaces his keys but finds them in his pocket.  He is so happy he is swinging them on his finger but they slip and fall into the open casket.  He tries to fish them out unnoticed with dental floss and a paperclip but fails in hilarious fashion.

From season 1 episode 6.  Adrian is investigating the death of a billionaire who tried to mug a man.  The victim of the mugging has a keychain with his college fraternity on it Phi Beta Tao.  This becomes an important clue later on.

Kong: Skull Island

One of the soldiers in the party keeps his rabbit's foot keychain on his helmet.

Rick and Morty

From season 1 episode 7, season 3 episode 7, and season 3 episode 2. 

Rick and Summer escape a planet controlled by females so naturally their vehicle is pink with a pink keychain. 

A Rick gives another Rick a gift of a new car, the keychain is a standard car fob. 

Summer is staying in an apocalyptic wasteland which has gotten somewhat civilized thanks to Rick, her Mad Max styled vehicle has an odd keychain, it might be a little skull.

Vice Principals

Russell shows Gamby the changes he has made to the school since becoming principal.  That includes changing the school mascot to the tigers.  Several shots of tigers merchandise were shown around the schools including keychains.  From season 2 episode 1

Preacher

From season 2 episode 6.  Preacher and the gang are in New Orleans and they need a soul.  All the normal soul dealers are getting pushed by a Japanese corporation.  The company uses an armored truck and to open it the guards must use both of their keys.  Their keychains have the company logo on them.

There's Something About Mary

Mary (Cameron Diaz) gives Ted (Ben Stiller) back his keys.  His keychain is a white rabbit's foot.

American Gods

While Shadow (Ricky Whittle) and Mr. Wednesday (Ian McShane) travel across the country on their mission they stay at various small motels.  Their keychains can be seen, a classic red diamond shape (from season 1 episode 1) and blue tag (from season 1 episode 3.)

In the season one finale Mr. Wednesday and Shadow travel to recruit Ostara/Easter (Kristin Chenoweth).  One of the Spring Goddess's well known symbols is the  Rabbit; Coincidentally(?) Mr. Wednesday is sporting a rabbit's foot keychain.

The Wolverine

Logan, the Wolverine, (Hugh Jackman) and Mariko (Tao Okamoto) are trying to hide from assassins so they pick an unlikely place, a "love hotel."  The hotel has differently themed rooms: a nurse's office, a mission to mars and a dungeon.  Each room key also has a keychain that matches the theme.  A red cross medallion, a rocket ship, and a pair of handcuffs.

Independence Day: Resurgence

David Levinson's (Jeff Goldblum) dad Julius (Judd Hirsch) stumbles across an abandoned group of kids and their bus.  He feels obliged to help them so he attempts to drive them to safety.  The bus' keys have a USA keychain.  Quite appropriate for this patriotic "franchise."

Superbad

At the beginning of the film Seth (Jonah Hill) picks up his best friend Evan (Michael Cera) and they head for school.  Seth's keychain can be seen which is a posable hand and it is set in an OK gesture.

Constantine

Constantine (Keanu Reeves) is performing an exorcism and he starts by attacking the demon with magical charms on his keychain.  They hurt the demon but it is far more powerful than he expected, foreshadowing a looming threat.  It is hard to make out details in the film but these pictures of the actual prop are quite clear.

Creed

Adonis Creed, son of Apollo Creed who was the best friend of Rocky Balboa, is desperately trying to get a trainer so he can become a professional boxer.  He storms his father's old training gym and puts up his car as a bet to any fighter who can beat him.  His keychain is a metal oval with the word racing on it. 

Sicario

Emily Blunt's character is blowing off steam by having a night out after her stressful mission.  The man who she is with raises her suspicions when he empties his pockets.  His basic electronic car fob can been seen on her coffee table.

Howling 2

From the notorious horror movie.  The main characters check into a hotel and behind the desk clerk a myriad of keychains can be seen.  Even the hotel must be cheap since the keychains are not consistent.

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.