SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06d6216018993e95b7221ab944a5400e87f67201cdb83792a252916935a55627' 
  AND token = 'gQG0SFgaJkQFf8xAMrNpuf5tBrlr+JI/w14ZTzyYKQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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