Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2773a388fc83fca3c0f1fcb291adff7ce5a6c69d7c92735c2a3765632dfdd5c5' 
  AND token = 'T+LwIRtFOAu9Z1XkiGXhB6Fv1rcN4ophnz0u4P7LTHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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