SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af041f879053d415eb46e9ca0c371d977f3de00e66ba5478284f770532eb1ca2' 
  AND token = 'gP84pZBIxjj5S/6kZOUoGryqdMYC4JxORHCFbNHhle0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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