SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33e42f893ea5a30c1710e0cfcad2f076273791689a3e4136a07897054a1a1632' 
  AND token = 'svzjvldbOnPoBODZW+vVtIq9cEYfgjzKOnlCQy2Gt+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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