SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ed9b249d26c416d5a9f40ddfc5b9f837960410104c057701ed7618010a536ca' 
  AND token = 'F74Iy5g0EMbC9Q+wtIG/1dyggvZ8FfmTccdHB4VYJFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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