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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c480977ec00da40ca5b48d4763f9ecc52382ed1fc806ab941e24401628d82c77' 
  AND token = 'RK8vfxADqPtAb6xy5nfmdkHrpp+iOh+PzkNraxc54ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}