Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a590cfe565a5056efe2394ff9597cb9952f82e36cf15f8f2c2e2b6ccc8f87044' 
  AND token = 'zBCIs4eWKIskl4i8IpixL4ni+omwYqFlkUL8SC4ZDZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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