SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49bf831da1d73af3aa47c320f821b31f6657c1ea30113caa6bf61822681b5b70' 
  AND token = 'vPWxFenTOJ6/BCJbvZ5fsGCBmMAmRSZsrNvXdLVHr+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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