Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d886d5a00aa0df25681fdbbe323f2ddb8764cfa966d0db6ac382a417a26604' 
  AND token = 'BO4PmAp5e/0wyLwAa33x3T+YzUYBD10PN0fKq8bt3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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