SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce91f27f4113db81736a66f258b8caae84a4cc268dfa89f0c8a873c4619eb91a' 
  AND token = 'x8GbhKQCgvqbIZqDNLFVQFDHYjC8PigtaVGpKtO5I7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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