SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff338b19af3cda72a6adb679ddcb31c369540b59bd87300fc28619f90c5455ba' 
  AND token = '2p0wddYjSimAFp9UC4lxqBLPQAFjGfdrSxBxTZWrGFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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