SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2153d9e992ab7fb312b9f46aa52b8ad54f7b2f28f7108d244495ad7f06abe3' 
  AND token = 'ZUO65aZ09HXVyVjvZaA63YTv8pVGcPDlD4BujYMB9b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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