SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9e1fd22340142923595a05239460eb68bf51f9051374b7e615b4402a4cb53df' 
  AND token = 'mt0s1jvQNs0ruY9TZUF+UAWKuNMnSxOCScqQNX+cGpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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