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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbbddfbebcea9c721837c63bd66c7d29b766c91e6639da18a76484c97e9dab72' 
  AND token = 'zarTHeKCiljbkV4AMnRQOSzmC666g22VkCzY237nQ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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