Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1b00035f2a7fddfe6acd2e7f22609154c35f7b43ccee8c82a42f4b311fffc3a' 
  AND token = '/x3u6r3RxoEvGUpz0ltFLN7kMoL3X6uxMgiPbdkBvgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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