SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29b00b7e1ebf3bd189a87f94730ea8f8bec06f1a20ff06da603e5c0202f12002' 
  AND token = 'pZwqY/xzMh6GM/TIMuLk+Y8BbZWArjVgHLNR/2Wb53o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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