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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '689250b62ac25b2ded866269dcda71a77cb2d36ca34f629d4e8127c7207056ad' 
  AND token = 'ghjl4fGEmesesjE7VVueGHZgIRVqXSpmQ2nX/LkXGc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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