SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96baad1ffaa71e0c6057123abf54279706aba9457bd7d2d1657c959fa335483' 
  AND token = 'tI7qhQjvVatal4PmBSCEEq5whHXN2iWfzbgQF/US1JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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