SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02bd489a4f62d320530a33f62dbe8ade10667ea6508d89b44be9bf3336695ca0' 
  AND token = 'Gz1SmMA1HxjJqFSTqOv+yWoIQ7gZJ2V4k+njbYKurZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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