SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce72b7a253f98b2f44685f0a637c30c7bd862f680fea656d7c971a7719cd64a9' 
  AND token = 'z7oMzTLKROrJKxy+lNfgCQ76eXUBYbzUusUhYVJgPxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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