SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46d63305484246d02f0783d2f72451f8ceb82896f44749cb2ec4fa8852c549cd' 
  AND token = 'tCh/xxF7KfT/PJppNNhvscqVF+ebJBzqTdEVHFAVMPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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