SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd550a7ba685b9d5671374fc3b44e76b695976d4b19d51aae42ea041ae0fc5984' 
  AND token = 'RFjI1P8mi6BLiZBfcOS4+/CvpmUtolSjT36HhvYGcpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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