SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95d397c70e2dc6b2aea333d1d77b90238f664e5ef386774c6e6a9d0e6877141f' 
  AND token = 'XGWpmdkBl0eEdYV4ZRP6v9hzG+/5ORnNpUAkwfhrQl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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