SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '518b9c84e2142050139e2b97ea54552ff58d17937b50ad0ef04d5565066ae46f' 
  AND token = '/JKD4MPzslZBPklw+RDz0LWpKHnVTZnPgycK0F9hwFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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