SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a7e449ac533471e8893fe3ec7858a941cb3c823377ab5c4c4dd950e9b19da7' 
  AND token = 'UOwqt7jSHVKK5GYgi+pG/jPzBY3vOrjjsTguzyYtIyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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