SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bb5fa260f6e97f12533faf0762e80308dfe6131c5b8671e8c1005a98ceb57c9' 
  AND token = 'IsLoJnAUCITNhP+khqp2/iOVYChgc6RnuQZBzyo+Gvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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