SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bbf97a20c64806647095c07b953456fdb015235b7eb3da27bfef7ea1998e472' 
  AND token = 'jTYblWngnnCafIghFTvDXxvpIGhfxJaL8YyPMGOqIm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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