Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3f5ef72c441ac7f613b2b49ee14142d564fd7cfbfc1a8cfcbe029701fa26ee3' 
  AND token = 'MMgyIxwHCJQSyxIRMtdSVJLZ9riBw+9IhoBThw9npis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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