Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '550eadafc179168bd8a791a800e584329a91292960e269ea9efcf534ccb38292' 
  AND token = 'Cy5TxhZHgj5VC/IwXUy9iycAulvt8Vwu0bDGaiRBFdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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