Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc0c3a20ebf601ae56d26233f23e673b56d77a54c7fa57af7adffe73aa1abc00' 
  AND token = 'njgHU8PhsCvk7zhorxRNZfWyBinHsdPjOv5C+u5fYZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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