SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b220e1361d3aa7b3b5f69a9b18a994b067db2473012b2d4135ffafcfbf3a7d33' 
  AND token = 'X5VpidKCZz8F5QutEpVhgCMYEvDO33sRpwF/aYUM3ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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