SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fc2b539077a54e3f90d28013dd47f5e1eddadff7602b28c0a291413a3fc9483' 
  AND token = 'dDjH15R547cJZz9hbuYZue+uuEJKIc7DvOzZIG9LF+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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