SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b34ef397d4a27f63821bdf77fea3138cc861dc6e6a134cd855b822b31f058c1' 
  AND token = 'rI7/CjrzOyY1H2O2rlV6WPH8YLVUVvn/exuBtyyAnGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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