Give this a go?
SELECT emp_sno,emp_type, l_from, l_to, l_nature
FROM leaves_history
WHERE l_from <= NOW() AND emp_type = 1
EDIT Changed <= to >=
SELECT emp_sno,emp_type, l_from, l_to, l_nature
FROM leaves_history
WHERE l_from >= DATE(NOW()) AND emp_type = 1