SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adb0fc81557d6dbf9fdaf21ab174fccbb712b882ad3154ed9bb3b56087dcc946' 
  AND token = 'ejEBLvQqoXNNriIJXXXGiUtfP3skV1ppNqswpKYkvS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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