SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc2503c6ac1135379d48c06b7ea24862ceeb13e2d72c750479e7ee2d4cdda0d2' 
  AND token = 'RKHoXJimlv7OfRnQ3JovCWuJqyaVg9Zw/CRFjlYQSm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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