SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30fe130c0e364f28339312b6084a2a88011151113be5d5db0f881c5d03ed88b6' 
  AND token = 'AH77vNbKgLnlLIhv9o5jSgSvam+B/YiYxwmvO/nLH0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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