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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a39e6130fcecb18288080d9b686cf040e8d67438b41fd4eef86f575d96fc9aab' 
  AND token = 'AWBWSes3cRWR4LTzZHnD9iyw5B/u82Ls1RTlAbBnhTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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