SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e529b27f8cd75893a15d22d92cf26850d5789388410f49c0608492353786478' 
  AND token = 'GIMBOy4qnzOsuHfWw6GF3fFZskd1HiHbU+GQYpb8KAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}