SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3559e954e9354a327b31f84278bbfda3c9ec60baa6631e2fe08b856ff0dd7b65' 
  AND token = 'zpCbgHlD0yLbpHu7F1+HwiaxoGz9YoRtC/Jpe5OF2Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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