SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3547431e905a4a6f7015f0349ef270f666c492439239bc9b7cc0206e3132d76' 
  AND token = 'NqYY67ss8cVd6yaoQHhn8QMOVqo+U8KTL3FgzBnEhko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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