SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6efcd71865de3dd6cfc8707063029a292fa936560c16326849d2f2586248d556' 
  AND token = '1NmiJWH8kyJeKbkzloq4+VBcQAaYmEG+2dBwMtYyaLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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