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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '063ff0163a37a8167a39b5265659b29f765a9f3ac090e130148873a6a15f166f' 
  AND token = '58EFpx0lVjjL0pM6aKfJE4SLZoQHHaS18OBy3KiHsuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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