SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72a7b8ada77f9a620018371745037ee1c7c18df057c3398e36c2d27f125b7544' 
  AND token = '7dyJzHalsS/I+DBm1qXw9jWF16kDjFgwYDKwj5k/VO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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