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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '433e40e4f3afc555f723ddf74b9a74df5cba8c9d1be0d608111e175c382d6ba5' 
  AND token = 'tbwmjBln0Qt57+RBgqWtKpSADhnZKcF7AT0lqaUUyDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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