SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b26ea3b68c5de4ed1154d2f27cde97fc9158445dd9035cc746f568d7747fb7e' 
  AND token = 'zrZAGqQUMMkS6ChLkiW4aEzKWhP4uQA+mHUTgRjr2Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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