How to add an ascending row number (using some token) in front of each row in Views?
In your View add a new Field, Filter by Global and select:


  Global: View result counter
  
  Displays the actual position of the view result


Click the Apply button and if you want change the output select Rewrite the output of this field in the Rewrite results section, and in the Replacement patterns section you will see the [counter] token as:


  [counter] == Global: View result counter