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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '244731877c9d472ea80de0b2d72a7faf94a7fb6f9aa9716984cfeb987cebc780' 
  AND token = '8zG05TU0AF5v6Js8CjUGkTW1mRvingRYsST6Jk0C9Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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