Not scanning by index

I have a table:

create table forsamling (       id              SERIAL,       for_id          int4 unique not null,       kund_flag
 int8 not null default 1,       online          smallint default 0,       klar            smallint default 0,
 
);

create index forsamling_idx on forsamling(for_id,online,klar,kund_flag);

It has about 1000 entries in this table...

Why doesn't it go by indexes when i search the smallints and int8s, but it
works with the integer SERIAL (SERIAL creates it's own index)?

What can i do to make it go by index?

/Magnus

explain select * from forsamling where klar = 1;
NOTICE:  QUERY PLAN:

Seq Scan on forsamling  (cost=0.00..23.50 rows=1 width=88)

-----

explain select * from forsamling where kund_flag = 123;
NOTICE:  QUERY PLAN:

Seq Scan on forsamling  (cost=0.00..23.50 rows=1 width=88)


-----

explain select * from forsamling where for_id = 123;
NOTICE:  QUERY PLAN:

Index Scan using forsamling_idx on forsamling  (cost=0.00..2.01 rows=1
width=88)


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