SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2664736357d49f7c5ca18a90ff9f02cd1f744723d5ddd84c45de32aee15b435a' 
  AND token = 'Jq+fxoLvIjStbmjYs/EvusjUQLf/0hwBadvH0TkSD3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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