Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd03509f17ed3a84bbc6338e8e5d7e81a00273da510a5631216c6e93f44b137ad' 
  AND token = 'e2G6FCQCbZ+fALIdTccUPWNJxklE18RTF8wFbSgM7xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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