SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e87e72e5cf295463b663bc59aa3b968150f7885b67a26b6c9e5dfd2714bb2ad' 
  AND token = 'oTavzUmNZ3c1kPAB3v5IRCn8klY8pLsaNX6VsGKt+T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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