SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '566964eceb76e426293d7995d4c2922713f0696d9ae9c7710d0d7100e164ef32' 
  AND token = 'GhQ3/VieBVYQKipDlOPWUz2h/HPiovWl3gvCbNXJMjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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