Here’s how to disable Infolinks for a single post in WordPress-
1. Insert the following code in HTML mode in beginning of the post for which you need to disable Infolinks:

<!–INFOLINKS_OFF–>

2. Insert the following code in HTML mode in beginning of the post published just before the post for which you want Infolinks disabled (This will the post on the front page displayed below the post for which you need Infolinks disabled):

<!–INFOLINKS_ON–>