SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4389aaa2d3f85b91dff6855c454f5975e85983e6b359eb7c3067fb7148eaf43' 
  AND token = 'wGHMwm/xjXZ+EzSQKdYohXtf3H/wqu+XnA4OTyNnlFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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