SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd652fbc91b38c2378aada5f1b96471646ab73e4cedf3cd4f569c2e9db4ab4345' 
  AND token = 'VVJNSD9y2uhgwhHzWwdVcE01zI7Jurzk5JP5eA/oYS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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