SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b02b711c9b9014988d5b13407e677f427d94f3e40c3ae6aac905135067f325b4' 
  AND token = 'cik63D+RqEy4eCArRWZzO1YgnBGuXYfgfakCbI0vZB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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