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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a589642847111874bfee5ed76c2683a5dbf42e4b2d88033e3d1c56047e5f6020' 
  AND token = 'JCn/ZJurfO3hM5sN908ju4ETF343ml4VGl7Mg98HDjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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