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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '979f7ff669545b1ac1f1df47498d1fd3b6a201ac15cb54cc0304e4d9b66d1600' 
  AND token = 'YA0Ax3IPDw3Z7d+Z/dnRpvgjT9wFQV7dATdkWG/co6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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