Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56b9c3e3b2001847f80b3c91a91bd45d7b06619ca31543b10ffafd12e0fc74c' 
  AND token = 'OG29mmnHOjyD23g4Fzflr1YKK4QWmAbDAu5sua8ZAb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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