Boto DyanmoDB query: How to perform the following query?

I have a table with the following data:

place_id  |  lat_part  |  lat  |  lon_part  |  lon

And the following is the schema:

tb_places = Table.create('places', schema=[
            HashKey('place_id', data_type="S"),
        ], throughput={
            'read': 1,
            'write': 1,
        }, 
        global_indexes= [
            GlobalAllIndex('lat_index', parts=[
                HashKey('lat_part', data_type="S"),
                RangeKey('lat', data_type="N"),
            ]),
            GlobalAllIndex('lon_index', parts=[
                HashKey('lon_part', data_type="S"),
                RangeKey('lon', data_type="N"),
            ])
        ],
        connection=cm.db
    )

And now I want to do a query to find the place that is within 0.003 difference in lat and lon with given (gLat,gLon)

ie in mysql terms:

SELECT * FROM places WHERE lat_part = "9" AND 
    (lat >= gLat - 0.003 AND lat <= gLat + 0.003) AND 
    (lon >= gLon - 0.003 AND lon <= gLon + 0.003)