SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c4b65e4c7a145c65e223fa6f3dadf7e04db1fd829ee7af3555b5f2434751f6f' 
  AND token = 'wayXWtKIkxJTVHOyvnJY6MUHjGBKJ/Y2cfx6QrkznuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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