Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff85dcbc980f792801d5e1a9d232ab06fd2dbdece6a1915aacf9a5bbae292cdf' 
  AND token = 'X9KWOHPJSGXZil/QN58VYU4WTRYK+NTlXe1ZFWhAN8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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