SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30f398851fa9b4c691ca2e5cc77c96097fe65ef7cf258ff8568a4c24cfbd04e4' 
  AND token = 'ukdyiU3YQWqR+N5Dws8843LzVMoUzFRvrF8KnZDilFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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