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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b005c4e1aff96cd8dfff3d1bea82f525ba8ddf29060c02cb3ae274746c8c6923' 
  AND token = '4gWXcQ8uApoyZlLBXWI5XDK3MQaWZ6aNxF59pExLc7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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