SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd790a0d477df883793bfef3f7c112072135d8a21e4446dec34385170408b1376' 
  AND token = 'sQJExEZw/Rcl+0/5zFy09f9V4Gz616eLjKOWMyC4ozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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