It not proper way to get non custom option products using has_options field.has_option is set to 1 when it bundle.
Good idea to join the table catalog_product_option to collection and and using join query check product have custom option or not
Here
Step1: Get Collection of product which have option and then group them by product id
$Option=Mage::getResourceModel('catalog/product_option_collection')->addFieldToSelect('product_id');
$Option->getSelect()->group('main_table.product_id');
Step2: filter product collection by excluding those products getting from step1
$entityIds = new Zend_Db_Expr($Option->getSelect()->__toString());
$Collection=Mage::getResourceModel('catalog/product_collection');
echo $Collection->getSelect()->where('e.entity_id not in(?)', $entityIds);