SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6744036221e045c9b6c9e35b1c97f561bbec8b437b32950ecbf6a17ebe44747d' 
  AND token = 'lq1vz0HCXODXeFBBtZUfvglIgvhvt3fCuTyuXgWC/+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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