SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46c31b166f3436498742946b881d79a3859925b6fbe841fa71465e84ec6223ec' 
  AND token = 'b5D/CTOtowqximAFX2EzIfuY1qHTSivgtfRhuzb1Ob0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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