Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75f0e2a3f34e38b902efe975f2752e3de3552ceffa03df10c02c7e88216b43d' 
  AND token = '089/vJKXXguIva4wAzanlvMuzFy/zKalDD7RC7Gg1i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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