SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c61cab37c3d19db848343e8a530735a90f967222d40777be058eb273c1e7781' 
  AND token = 'goac7CZJhVbRBlX6jttT5eboC4P+v16WVz4Fyqv8lU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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