Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7e238d8a0efc4291d7ac9d8be14ed128172a882502d9f6cf9a0bb53b7dea357' 
  AND token = 'Jn0xMqMdF1Wd69VxrJbZQt/Clioyyd+AA4gb7Ep9i4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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