SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a54eb3dd3db774e02054a1582bdfacf1014feb25b97704117a6ecc19c7e55f9f' 
  AND token = 'ujxFssVjNhEIqAI+b/tz3YamLQZibYq3mWqzmlG1ThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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