SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '679ee89ee2a14251b0408060b85cbd7df733863fc9a62f8f1af7cc260f052dc6' 
  AND token = '1s0l3/ImBrwlvB+C0oBnZiiKLeHpqs/yOGQr+9wjVLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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