SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c0826abb21e29bc5c5e8756483bd948fc4a8cb416d71d3c5a41726d996fa0c' 
  AND token = '1e/wGm3hQbFu9EYYOGhT6Yo5RnBJQUycZ4qPi2Q4uw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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