SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f230b93b63be2c00dafce7e47ff4d7317399f3c0669574515eb1826d6c3c9863' 
  AND token = 'E+aMaGf9qvHCGnPK5WnSdPCovGygWuew7ZiitmzYWK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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