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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4778298357ce6386aa9e8f85504f26bb340e7704d29193cf6e87858650cff86' 
  AND token = 'nEkj++3pdkXJZPuZfABkEkyN9ZyCXGAl3UZqiqE59Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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