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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6036d5b03733674ca85a5173c6507094d34b0cadb14e6040e8d2d2d4cbcaa911' 
  AND token = 'JEVt3hlqKxGhqXKVWuT7XkFdKTRbK2yoGzkSwiz3Wnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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