SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f12069c1a36119338fc79be77bc662167a0ab08eff6cd6899e3446fb779b772' 
  AND token = 'sCChpZq9r+wJXN0kmr2g8558XRGIhakkRDK7vPvEB4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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