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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fc29f82eca957cc66dae7d5c3eaed9fb3a5ab38be512ee9b7385cdd83638d95' 
  AND token = 'FfnCZyhuQ7THTXCkDGYo0Y8KWvyqH0DyiqvC4MykJt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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