SELECT concat_ws(' ', nombre, 1ape, 2ape) 
as users 
FROM usuarios 
WHERE concat_ws(' ', nombre, 1ape, 2ape) 
LIKE 'toni toni toni' 

or 

SELECT concat_ws(' ', nombre, 1ape) 
as userss 
FROM usuarios 
WHERE concat_ws(' ', nombre, 1ape) 
LIKE 'toni toni'