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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e72cc1b616462425a1aeda198ebb78c17ea5120b0a96e9abf717adb81bb0de28' 
  AND token = 'zJ/2ElVgEVKybz0GBpt37Uk4pkfHLqO1mMIGTvv46uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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