SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42d06af0ca66151cb707cf9bef7c92d0d157e5b1df1285024ff65ee00330d9f7' 
  AND token = 'd0KdRvz6IJAbYUtng6G2+XWF+0zqYGL41pr3qN0+XP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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