For those traveling to Macau on a budget, there is a KFC branch in the Sands Hotel, located at the family area on the first level, just past the casino. If you can't find this area, just ask staff for the KFC and McDonalds and they will point the way. As suggested, KFC is across from a McDonalds franchise and game room also setup to offer some family-friendly entertainment here at the Sands.
Food on offer at the Sands KFC is basically the same as what you find in Hong Kong with similar prices, bumped upward to accommodate the more pricey location of being in a large casino. What makes this particular fast-food restaurant interesting is that you can use your Hong Kong Octopus card to pay for your food.
Overall, there are much more enjoyable hotel/casino resorts to visit than the Sands. These include the Venetian, City of Dreams, Galaxy and Wynn Hotel and you can find fast or budget-friendly food in or near all of these locations. So, there is no real reason to specifically target this KFC. However, if you do find yourself in this area, its a decent option to be aware of.