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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4ded4e848ad099743890edd361fc1aee7cce8c9a6d4c1eb50f8e9abd8c79ea7' 
  AND token = 'o9HbYWlHfhEZqX0BKLGkT5Fb5t/xwFUrth6lqmhKWWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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