SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '572f23caa9b79201b0df74fd3d1de8f7ba42ca35d2256854bfc8da3e08f12413' 
  AND token = '0CaqsTAxH6oU1WByA5YCSWQHvyChmKBX9Gf5dLJ7kcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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