SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aef838abf24654c4ac9c1fc987b0751b6e9dea65731907b03a7b14d58240ca78' 
  AND token = 'ndAHTIsgLa+jKjeKZ2DlRNyCLYHoLyshc2Bj05fBrew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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